2016 Annual Research Report Hanna Sizemore Research Activities (1) Dawn at Ceres Guest Investigator

2016 Annual Research Report Hanna Sizemore

Research Activities

(1) Dawn at Ceres Guest Investigator – global geologic mapping of morphological features related to ground ice. As a Dawn guest investigator I am using Framing Camera data to identify, and catalog morphological features that are potentially diagnostic of water ice in the shallow subsurface of Ceres. Features of identified to date include domed hills, lobate ejecta and flows, and pitted terrains. A major focus this year has been understanding the mechanism of pitted terrain development on Ceres. I am also participating in the coordinated geologic mapping effort underway at Ceres by producing maps of the Ac-H-13 Urvara Quadrangle. (2) Laboratory investigation of ice lens development on Mars: continued hardware development/modification with Michael Mellon. In 2014-2015 we fabricated a small Mars environmental chamber at Southwest Research Institute (SwRI) that allowed us to deposit ice in soil from the vapor phase and observe the ice segregation process. Preliminary science results were consistent with theoretical predictions. The focus of our efforts in 2015-2016 was transporting all hardware to Johns Hopkins University Applied Physics Laboratory (JHU-APL), re- assembling the experiment, and making a variety of hardware upgrades. My focus has been humidity control and measurement systems. (3) Theoretical investigation of frost heave and rock mobility in martian permafrost. Efforts this year focused on improvements to numerical models and acquisition of new empirical constraints on input parameters.

Peer Reviewed Publications:

D. L. Buczkowski, B. E. Schmidt, D. A. Williams, S. C. Mest, J. E. C. Scully, A. I. Ermakov, F. Preusker, P. Schenk, K. A. Otto, H. Hiesinger, D. O’Brien, S. Marchi, H. Sizemore, K. Hughson, H. Chilton, M. Bland, S. Byrne, N. Schorghofer, T. Platz, R. Jaumann, T. Roatsch, M. V. Sykes, A. Nathues, M. C. De Sanctis, C. A. Raymond, C. T. Russell. (2016) The Geomorphology of Ceres. Science, 353, doi: 10.1126/science.aaf4332.

T. H. Prettyman, N. Yamashita, M. J. Toplis, H. Y. McSween, N. Schorghofer, S. Marchi, W. C. Feldman, J. Castillo-Rogez, O. Forni, D. J. Lawrence, E. Ammannito, B. L. Ehlmann, H. G. Sizemore, S. P. Joy, C. A. Polanskey, M. D. Rayman, C. A. Raymond, C. T. Russell. (2016) Extensive water ice within Ceres’ aqueously altered regolith: Evidence from nuclear spectroscopy. Science, doi: 10.1126/science.aah6765.

A. Nathues, M. Hoffman, T. Platz, G. S. Thangjam, E. A. Cloutis, V. Reddy, L. Le Corre, J.-Y. Li, K. Mengel, A. Rivkin, D. M. Applin, M. Schaefer, U. Christensen, H. Sierks, J. Rpken, B. E. Schmidt, H. Hiesinger, M. V. Sykes, H. G. Sizemore, F. Presusker, C. T. Russell. (2016) FC colour images of dwarf planet Ceres reveal a complicated geological history. Planetary and Space Science, 134, 122-127.

Conference abstracts, first author:

Sizemore, H. G., et al. (2016) Ice on Ceres. Ices in the Solar SystemWorkshop, ESA/ESAC Madrid, Spain (invited keynote presentation). Sizemore, H. G., et al. (2016) Preliminary Constraints on the Volumetric Concentration th of Shallow Ground Ice on Ceres from Geomorphology. 47 LPSC, abstract #1628. Sizemore, H. G., et al. (2016) Geological Mapping of the Ac-H-13 Urvara Quadrangle of Ceres from NASA’s Dawn Mission, Geophysical Research Abstracts,Vol. 18, EGU2016-10525. Sizemore, H. G., et al. (2016) Geological Mapping of the Ac-H-13 Urvara Quadrangle of Ceres from NASA’s Dawn Mission, 47th LPSC, abstract #1599.

Conference abstracts, contributing author:

Crown, D. A., et al. (2016) Geological Mapping of the Ac-H-14 Yalode Quadrangle of Ceres from NASA’s Dawn Mission, Geophysical Research AbstractsVol. 18, EGU2016-9445-1. Crown, D. A., et al. (2016) Geological Mapping of the Ac-H-14 Yalode Quadrangle of Ceres from NASA’s Dawn Mission, 47th LPSC, abstract #1602. Platz, T., et al. (2016) Geological Mapping of the Ac-H-10 Rongo and Ac-H-15 Zadeni quadrangles of Ceres from NASA’s Dawn Mission, Geophysical Research Abstracts, Vol. 18, EGU2016-18352. Platz, T., et al. (2016) Geological Mapping of the Ac-H-10 Rongo and Ac-H-15 Zadeni quadrangles of Ceres from NASA’s Dawn Mission, 47th LPSC, abstract #2595. Schenk, P. M., et al. (2016) Central Pit and Dome Formation as Seen in Occator Crater, Ceres, American Astronomical Society, DPS meeting #48, id.506.04. Schmidt, B. E., et al. (2016) Icing in the Cake: Evidence for Ground Ice in Ceres. American Astronomical Society, DPS meeting #48, id.407.03. Schmidt, B. E., et al. (2016) Ground Ice on Ceres? 47th LPSC, abstract #2677. Schorghofer, N. et al. (2016) The Permanently Shadowed Craters of Ceres as Seen by the Dawn Spacecraft, 47th LPSC, abstract #1629. Yingst, R. A., (2016). Urvara and Yalode Basins: Stratigraphic Markers in the Geologic Record of Ceres. 47th LPSC, abstract #1787.

Outreach:

(1) Keynote speaker, Pocahontas County 8th Grade Luncheon (2) Presenter, Green Bank Elementary-Middle School Career Fair (3) Guest speaker, Physicists Inspiring the Next Generation (PING) 2016, NRAO-GB (4) NRAO-GB Science Lunch speaker, Pitted Terrains on Dwarf Planet Ceres